Author's Organization:Department of Earth Sciences,Faculty of Science,Naruto University of Education Department of Earth Sciences,Faculty of Science,Naruto University of Education Research Institute of Natural Sciences,Okayama University of Science
Published: November 15, 1997Received: March 21, 1997Available on J-STAGE: April 11, 2008Accepted: July 25, 1997
Advance online publication: -
Revised: -